"People do impulsively shop and blow out their budgets when they're drunk," said finder.com consumer advocate Michelle Hutchison.

The survey shows Americans spent more than $30 billion while drunk last year, with men outspending women two to one. Individual respondents reported spending twice as much while drunk as respondents to the previous year's survey.

"I think it is a really concerning thing to see people spending more when they're under the influence," Hutchison said.

Shopping online while drunk is nothing new. Consumer psychologist Kit Yarrow first wrote about it almost a decade ago, and says it makes perfect scientific sense. When alcohol gets to the brain, it affects the cerebral cortex, which lowers inhibitions, and also the hippocampus, which heightens emotions, she said.

"The combination of lower impulse control and more emotion often times is going to result in hitting that buy button," Yarrow said.

Though it's been a topic of discussion among researchers for only a few years, Yarrow mentioned the effects of alcohol on shopping decisions in her 2009 book "Gen BuY."

"It just wasn't as common back then because I think people weren't shopping online as much back then," she said.

Now, with stored credit card numbers and one-touch ordering, shopping online while drunk is a good way to get a surprise delivery on your doorstep.